Stealth Heater

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If you have answers, please help by responding to the unanswered posts.
Which wire gauge is good to get? The 16 or the 14 on the Ranco Controller?
I'm not sure what guage wire I used. I bought 2 3-prong (grounded) extension cords with 3 female outlets on the other end, cut them in 1/2 and used that. I think the extension cords were about $5 each from HD.
Since you guys are talking about stealth heaters....this may be the dumbest question ever, but are they submersible? I bought a used tank and it came with a stealth heater but I don't know if I can put right under or not. Thanks a bunch. :)
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